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United States Patent | 5,234,331 |
Schmidgall | August 10, 1993 |
An automated concrete pipe making machine that utilizes an automatic feeding system in which a feed tray and its feed pan are mounted on a carrier that moves from a retracted position into a feeding position where the feed tray is aligned with and locked to the pan at the top of the form or forms to be filled. At the appropriate time after the forms have been filled, the feed pan is withdrawn onto the feed tray, which is then unlocked from the top of the form and retracted.
Inventors: | Schmidgall; Ronald D. (Des Moines County, IA) |
Assignee: | Hawkeye Concrete Products Co. (Mediapolis, IA) |
Appl. No.: | 729476 |
Filed: | July 12, 1991 |
Current U.S. Class: | 425/259; 425/261; 425/453 |
Intern'l Class: | B28B 021/24; B28B 013/02 |
Field of Search: | 425/453,258,26 R,DIG. 201,145,256,259,261 222/305,306 |
3577610 | May., 1971 | Margolin | 425/259. |
3970223 | Jul., 1976 | Longinotti | 425/258. |
4063859 | Dec., 1977 | Halle et al. | 425/259. |
4102367 | Jul., 1978 | Shulman et al. | 425/258. |
4321028 | Mar., 1982 | Van de Caveye | 425/424. |
4708621 | Nov., 1987 | Schmidgall et al. | 425/259. |
4957424 | Sep., 1990 | Mitchell et al. | 425/424. |
5040968 | Aug., 1991 | Kraiss | 425/262. |